Concrete form securing means



Dec. 26, 1961 c. J. JENSEN ET AL 3,014,585

CONCRETE FORM SECURING MEANS Filed Aug. 3, 1959 3 Sheets-Sheet 1 CLARENCE J. JENSEN SOREN C. Jsu s g r l Dec. 26, 1961 c. J. JENSEN ET AL CONCRETE FORM SECURING MEANS 5 Sheets-Sheet 2 Filed Aug. 3, 1959 I! N m m 2 N J S N N v. m m Jam -W- WC ..P\) .L N V. H E B E R 0 3 M 4 m 7 m F Q 9:

Dec. 26, 1961 c. J. JENSEN ET AL CONCRETE FORM SECURING MEANS 3 Sheets-Sheet 3 Filed Aug. 3, 1959 CLARENCE J. JENSEN INVENTORS, SOREN C. JENSEN United, States Patent G 3,014,685 CONCRETE FORM SECURING MEANS Clarence. J. Jensen and Soren C. Jensen, both of 4604 Meridian Ave., Seattle 3, Wash. Filed Aug. 3, 1959, Ser. No. 831,272 1 Claim. (Cl. 248-654) This present invention relates to means for supporting concrete forms in position and more particularly to extensible horizontal strut means for supporting the forms used in making stairs, ramps and the like, which are put in place between existing walls.

In concreteconstruction work, certain techniques and equipment have been developed to facilitate the construction of relatively large concrete masses and particularly walls of considerable extent. Such equipment has fostered a technique wherein the principal structural portions of a building may becompleted and the forms stripped from the set concrete. It is then necessary, in order to complete the'structure, to construct new forms and pour, the smaller increments of the building. This relates particularly to stairs, ramps and the like, which are relatively narrow and normally rise from one floor to the next floor above. In the past, it has been customary to employ supporting posts and then to frame the form structure in place. Such small work has been tedious and time consuming and expensive. With our present equipment, we provide means whereby temporary support can be had for such stairs and the like so that the forms can be put in place with adequate strength to support the green concrete and to further accept the strain incidental to the currently used method'of vibrating the concrete into the forms.

The principal object of our present invention therefore is to providemearis for supporting" concrete forms, which are .disposed between bounding walls which are alreadyin place.

A further object of our invention is to provide extensible strut means, which may be employed between two fixed walls and which may be relied upon to hold the entire weight of the concrete structure during its pouring and curing stages.

A further object of our invention is to provide metal fittings, which may be applied to relatively short lengths of scantling, which may be discarded after its use, if desirable.

A further object of our invention is to provide form supporting means that are characterized by their initial low cost and by the ease of which they may be put into place and removed after their purpose has been served.

Further objects, advantages and capabilities will be apparent from the description and disclosure in the drawings, or may be comprehended or are inherent in the device.

In the drawings:

Referring to the drawings throughout which like reference characters indicate like parts,

FIGURE 1 is a perspective view, partly in section, illustrating the manner in which our form securing means is employed in constructing the riser walls of a flight of stairs.

FIGURE 2 is a perspective view illustrating the metal components normally used as the basis of our present invention.

FIGURE 3 is a fragmentary plan view, partly in section, illustrating the metal elements of FIGURE 1 and illustrating how they are employed in association with wooden compression members.

FIGURE 4 is a vertical sectional view through a typical stairway illustrating our form securing means as used in providing the riser wall of the stairs and with enlarged strut members which support the entire stairway during its construction.

FIGURE 5 is a perspective view partly in section illustrating the construction of our concrete form securing means which is employed to support heavy weights.

Referring to the drawings, numeral 10 designates our movable bracket member and 12 our coacting fixed bracket member. For most uses these members are formed as unequal leg angles and are normally rolled from heavy metal plate stock. These brackets have face portions, as 14 and 16 respectively, and flange portions 18 and 20 respectively. A threaded metal jack screw 22 is fixedly secured, at one end, to the flange portion 20 of the fixed bracket as by welding thereto. The flange portion 18 of bracket 10 has a suitable opening so that screw 22 can pass through and maintain the face portions 14 and 16 with their outer surfaces in the same plane. A suitable adjusting nut 24 is provided, which is disposed between flanges 18 and 20, and provides the adjusting means for spacing the flanges apart and, when all the elements are assembled, the screw 22 and nut 24 provide the extensible means whereby the strut can be rigidly secured between parallel walls. For certain uses, it is desirable to employ square or Acme threads on bolts 22.

The movable bracket 10 is provided with a plurality of nail or screw openings 30. The fixed bracket member 12 is provided with a plurality of openings 32, that might accommodate screws although normally nails are used in this bracket so that the long strut, which is seand separately stored, transported or put to other use.

Secured to face portion 14 of bracket 10 isa short wooden strut member 40. This member has its ends abutting flangelS and is held in engagement therewith by a plurality of nails or screws indicated generally at 42. Strut member 40 is provided with a bore 44 suitably positioned so that as screw 22 passes through opening 46 in flange .18 it will be free to move into strut member 40 substantially the full distance covered by the threads on the screw. It is because of bore 44 that strut member 40 is normally considered as a permanent attachment to the movable bracket member 10 and thus obviates the repeated boring of holes 44.

The fixed bracket member 12 is secured to the long wooden strut This strut need only be cut to appropriate lengths according to the intended use and then secured, after the showing of FIGURE 3, by a plurality of nails 52 passing through openings 32 in the face portion 16 of bracket 12. In many cases, double headed nails are employed so that the long strut can be quickly removed from the fixed bracket member, when it has served its purpose.

To accept the heavy loading occasioned in supporting the entire stairway as it is being built, it has been found desirable to use heavier strut members, as the long strut 60 and the short strut 62, after the showing of FIGURE 5. The fixed bracket 64 and the movable bracket 66, as shown in FIGURE 5, are similar to the lighter brackets shown in FIGURE 2. However to take care of the greater weight, it is desirable to use two transversely spaced jack screws 22, preferably using Acme threads, and in addition to the nuts 24 to also employ lock nuts as 25. The fixed bracket 64 and the movable brackets 66 have face portions 70 and 72 respectively. Face portion 70 is normally secured to the long strut member 60 by a plurality of nails or screws passing through suitable holes in the face portion. It has been found desirable to strengthen the short strut member 62 and, to this end, face plate 72 is secured to the wood portion 62 by means of a plurality of through bolts as 74. These bolts preferably pass through tie straps as 76 which serve both as Washers and to tie the bolts together to prevent any splitting of the wood. The splitting is somewhat of a problem, since the preferred length of the strut member is short and, in addition to the bolt holes 44, it is mortised out to accommodate guide members 78. Guide members 78 are cylindrically bored and recessed into the wood and are formed integrally with base portion 72 so that they serve to guide the free ends of bolts 22 and give the structure the maximum. in strength for a given weight. It is to be noted that the threaded screws 22 pass freely through an unthreaded opening in guide member 78. The long strut member 60 is further protected against splitting by a reinforcing bolt 80 passing through the wooden member 6% from edge to edge and by having the angle clamp members as 82 for added sccurity. Bolt 80 should be employed as close to the position shown in FIGURE as the other structural arrangements will admit.

Method of use In using our present equipment, it is first necessary that the enclosing walls for a new structure, as 84 and 86, be in place. When the bottom position of the corn crete has been determined the supporting members, consisting of the struts 60 and 62 are put in place. The number used will be dependent upon the total weight that each one must support. These members are fixed in position by extending members 60 and 62 by means of the two coacting jack screws 22 and nuts 24. When a secure positioning has been achieved, the lock nuts 25 are tightened or nuts 24 and thus lock the device against loosening, especially from vibration and the like. The stringers 90 and decking 92 can then be put in place. With the upper surface of decking 92 in position, the riser securing members can then be located and should be extended by means of jack screws 22 and nuts 24 until they are secured, with the plane of the timbers forming struts 40 and 50 in a vertical plane. The riser face forms 94 can then be lightly toe-nailed to strut member 4 and the form is completely ready for the pouring of the concrete C. a

It is believed that it will be clearly apparent from the above description and the disclosure in the drawings that the invention comprehends a novel construction of a concrete form securing means.

Having thus disclosed the invention, we claim:

A concrete form securing means, comprising: a long strut and a short strut disposed in spaced longitudinal alignment, said struts made of wood of rectangular crosssection; a movable angle bracket, having a face portion and a flange portion fixedly secured to said short strut; a fixed angle bracket, having a face portion and a flange portion secured. to said long strut, said brackets formed of unequal leg angles wherein the face portions have greater extent than said flange portions; a pair of transversely spaced threaded jack screws secured at one end to the flange portion of said fixed bracket and adapted to pass through an opening in the flange portion of said movable bracket; nuts threadedly engaging said face screws between said flange portions, and disposed to bear on the flange portion of said movable bracket to space them apart; said short strut having longitudinally disposed recesses to receive said jack screws and metal guide members for said screws fixedly secured to the face portion of said movable bracket and bored so said screws may pass freely through said guide members and reinforcing means for said short struts consisting of transverse metal tie straps and through bolts joining said movable bracket face portion and said tie straps in clamping relationship on the wooden short strut.

References Cited in the file of this patent UNITED STATES PATENTS 757,306 Heyssel Apr. 12, 1904 818,665 Burton Apr. 24, 1906 1,256,849 Yandreuil Feb. 19, 1918 FOREIGN PATENTS 301,675 Great Britain Dec. 6, 1928 

